Malicious PDF — malware analysis report

Static analysis result for SHA-256 90843b6be7a5644d…

MALICIOUS

PDF

75.3 KB Created: 2021-06-07 19:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d0610a0285e3f534a83cb03578d13266 SHA-1: a99cbb989063302090962df34185fcab3bb9bf96 SHA-256: 90843b6be7a5644ddec517f0f9f31745cc8b75cf18498dcf980cc428406c5ede
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to disposable hosting and appear to be part of a link farm. One of the primary URLs, https://crewmak.ru/pbw, is likely used to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/pbw?utm_term=ejercicios+de+perspectiva+isom%25C3%25A9trica+nivel+1+resueltos PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372737/normal_5fffb79290461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_603d54d23324e.pdfIn PDF document text
    • https://guzifako.weebly.com/uploads/1/3/4/0/134096492/bokenikupogazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_604e32ad5e99e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_60bc8736017b8.pdfIn PDF document text
    • https://dawerofe.weebly.com/uploads/1/3/4/3/134361643/6d14fb91c5d7e0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_60b924f20eefd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_606e92fcafea7.pdfIn PDF document text
    • https://zojujevekuki.weebly.com/uploads/1/3/0/9/130969212/7a393656.pdfIn PDF document text
    • https://xigodawi.weebly.com/uploads/1/3/4/4/134464905/xinepuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_6025b22cc3b88.pdfIn PDF document text
    • https://somomakimemabox.weebly.com/uploads/1/3/2/7/132741269/8674081.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b5e391c-c364-4e08-98d0-ebc7136a7b93/deni_ice_cream_maker_5100_manual.pdfIn PDF document text
    • http://kiruguwota.pbworks.com/f/english_grammar_worksheets_for_class_8_cbse_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211af46c-8e7b-4010-904b-801c7f447feb/52517469105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5126aa60-1404-43dd-a8f8-7e5f11dfa8df/literary_devices_used_in_letter_from_birmingham_jail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bd569f-56ad-40e2-a312-9a330ce4f66e/58361206790.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/w/file/fetch/144502419/bohemian_rhapsody_bass_riff.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/73259282370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ec0ca4-64d4-47cf-bf3c-f555b0f38079/oracle_database_11.2.0.4_download_for_linux_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8b0a28-6a02-497c-9dd5-025ea5fc994f/46247492655.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/w/file/fetch/144471747/73068283115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/992e939b-f930-43b9-860d-5bf2da37b2b5/what_is_covid_rapid_testing.pdfIn PDF document text
    • http://vokoperoj.pbworks.com/w/file/fetch/144786774/computer_programming_book_bangla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2814c576-e97d-495b-a6ee-7d1d54bfa022/45426436774.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 5508 bytes
SHA-256: cda90a7f8075e90932950a1b2055ecaefe3c912290523a098befcd5a8bd4c072
font_01_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 10724 bytes
SHA-256: 0b800f7a2ff6bd4cf5683823b52cfc7020de7a9a24ee45247ab72862f05d08ef

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